• Racharla Narasimha Raju Varma
• Dr. Sanjay. B. Borghate

This paper study focuses on the effect of vertical geometric irregularity i.e., unsymmetrical setbacks in reinforced concrete buildings. Different national codes given standards to quantify the geometric vertical irregularity which only depends on the horizontal dimension of lateral resisting system of structure. Realistic response of this irregular buildings can be appropriately studied from the nonlinear dynamics analysis that is Non-linear Time history Analysis (NLTHA) than Linear static procedures. In this study, two regular buildings of 6 and 9 storeys are considered for the reference and three different setbacks of 20, 60 and 80 percent of horizontal dimension are introduced one side in these designed regular buildings. Each regular building is analyzed and designed as per IS 1893: 2016 and IS 13920: 2016 clauses and in these designed regular buildings, the setbacks are introduced and with seven ensemble of ground motions, Nonlinear time History Analysis (NLTHA) is carried out with adoption of auto non-linear hinges as per ASCE 41-13 in SAP2000. The inelastic drifts are used to assess the performance of these considered regular and irregular buildings. From this Nonlinear analysis, it is observed that, as the percentage of setback increases the drift increased at corresponding storey level. Hinge formation at setback level reached more deformation capacity than the other storey levels, it indicates there is more seismic demand at that level.

Reinforced concrete building, Vertical irregularity, Non-Linear Analysis, Inelastic response.

"EFFECT OF UNSYMMETRICAL SETBACKS IN ELEVATION OF RC BUILDINGS", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 5, page no.22-27, May-2019, Available :http://www.jetir.org/papers/JETIRCA06005.pdf

"EFFECT OF UNSYMMETRICAL SETBACKS IN ELEVATION OF RC BUILDINGS", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 5, page no. pp22-27, May-2019, Available at : http://www.jetir.org/papers/JETIRCA06005.pdf